The invention provides a transformer substation secondary drawing searching method and system, and the method comprises the steps: obtaining completion drawings of all equipment of at least one transformer substation, converting a paper drawing into a scanning copy, and then carrying out the classification and storage; scanning parcels and an identification code database are established, each scanning parcel corresponds to one identification code, and each two-dimensional code is matched with corresponding equipment; during troubleshooting, scanning the identification code on the specified equipment through the intelligent equipment to obtain a corresponding substation secondary equipment drawing. The drawing searching time is greatly reduced, the drawing searching time each time is reduced to be within 50 minutes, the drawing searching time during troubleshooting accounts for 71.65% of the total time and is reduced to 55.74%, the power troubleshooting efficiency is greatly improved, and the stability of power supply is effectively ensured.